Issue link: http://read.dmtmag.com/i/859318
Hydraulic Fluids Background & Properties castrol.com/GPS 800 255 4417 May 2025 GPS Industry Specifications Performance standards for anti-wear hydraulic fluids are set primarily by original equipment manufacturers. Unlike engine oils, anti-wear hydraulic oils do not have an industry licensing procedure. erefore, anti-wear hydraulic fluid users must seek out information on test results from the oil manufacturer itself. Without a standard industry licensing program, it is worthwhile for users to research hydraulic fluid choices carefully. Castrol's Liquid Engineers have developed a range of hydraulic fluids to meet performance standards required by Original Equipment Manufacturers (OEMs). ese include products that meet recent changes in hydraulic fluid formulation, driven by industry trends and OEMs: • Improved oxidation stability to accommodate higher operating temperatures. • Improved air release, foam control and water separation to handle smaller reservoirs and reduced cycle times. • Improved dry/wet filterability due to reduced filter pore size and tolerance to water contamination. • Better hydrolytic stability to handle water contamination. • Extended pump life to meet Denison T6HZOC pump performance. • Increased drain intervals requiring the lubricants to retain original performance longer. Importance of Oxidation Tests When selecting a hydraulic fluid, resistance to oxidation is a key component of performance. e ability to protect against oxidation in the oil prevents premature oil thickening, sludging and other critical lubrication failures. Good oxidation protection comes from the combination of base oil selection and quality of the additives. Types of oxidation tests include: Turbine Oil Oxidation Test (ASTM D 943) is test measures the oil's ability to prevent oxidation and the formation of destructive acids. To pass HF-O, the oil's acidity level must not exceed 2.0 mgKOH/g aer 1500 hours. Test Criteria Time to 2.0 TAN, hours 1,500 min Rotary Pressure Vessel Oxidation (ASTM D 2272) is test utilities an oxygen pressurized vessel to evaluate oxidation stability of lubricants in the presence of water and copper @150°C. Test Criteria Time to 25-psi loss in minutes HF-O, HF-2 1500 ermal Stability: Cincinnati Milacron is test evaluates whether an oil will cause a reaction to steel and copper components. Run for 168 hours at 275°F. C2 ecastrof